Translation of "sidereal year" into Welsh

blwyddyn serol is the translation of "sidereal year" into Welsh.

sidereal year noun grammar

The orbital period of the Earth; a measure of the time it takes for the Sun to return to the same position with respect to the stars of the celestial sphere. A sidereal year is about 20.4 minutes longer than the tropical year due to precession of the equinoxes. [..]

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